Hormone Manufacturing Co.) 1) For comparative experiments of the effectiveness of long acting male sex hormones. Each 100mg. of testosterone propionate, testosterone heptanoate, testosterone cyclopentylpropionate, testosterone isobutyrate and testosterone undecylate was dissolved in oil and injected into normal male rabbits subcutaneously and 17-ketosteroids and steroid alcohol in urine were determined and these results were compaced. Vol. 34 No. 6 roid alcohol were 53mg. for testosterone

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... nate, 39mg. for testosterone heptanoate 48mg. for testosterone phyenylpropionate, 61 mg. for testosterone cyclopentylpropionate, 43mg. for testosterone undecylate, and 21mg. for testosterone isobutylate.